Fan coil units (FCUs) are essential terminal devices in central air conditioning systems. They consist of low-noise motors, coils, and fans that cool or heat indoor air by passing it over a heat exchanger. However, prolonged use causes dust and dirt accumulation, reducing heat exchange efficiency and impacting system performance.
This guide provides a step-by-step cleaning method for fan coil units, along with common troubleshooting tips to improve air quality, reduce noise, and enhance energy efficiency.
1. Why Regular Cleaning is Necessary
🔹 Dirt buildup on aluminum fins reduces heat transfer efficiency, affecting cooling and heating performance.
🔹 Condensation trays collect water, leading to bacterial and algae growth, which can clog drainage pipes.
🔹 Accumulated dust in fan motors and blades increases noise levels and reduces airflow.
🔹 Blocked air filters restrict airflow, increasing energy consumption and reducing system efficiency.
💡 Cleaning every 1-2 years is recommended to maintain optimal performance.
2. Fan Coil Unit Cleaning Process
2.1 Cleaning the Air Return Filter
1️⃣ Remove the return air grille and filter.
2️⃣ Use a high-pressure water gun to wash away dirt and dust.
3️⃣ Let the filter dry completely before reinstalling.
2.2 Cleaning the Air Supply System
✔ Disinfect air ducts to remove bacteria and prevent contamination.
2.3 Cleaning the Cooling/Heating Coil (Heat Exchanger)
1️⃣ Use a non-corrosive cleaning agent to remove dirt, scale, and bacteria.
2️⃣ Spray cleaning solution onto the aluminum fins and let it sit for 5 minutes.
3️⃣ Rinse with clean water using a high-pressure washer.
4️⃣ Ensure the fins are clean enough to see 2-3 rows of copper tubes.
2.4 Cleaning the Fan Blades & Motor
1️⃣ Carefully remove the fan drum and blades.
2️⃣ Inspect the motor and capacitor for signs of burnout.
3️⃣ Brush off dust and dirt from the fan and motor housing.
4️⃣ Lubricate the motor shaft to ensure smooth operation.
2.5 Cleaning the Drain Pan and Drain Pipes
1️⃣ Remove accumulated sludge and debris from the condensate tray.
2️⃣ Add 3 disinfection tablets to prevent bacterial and algae growth.
3️⃣ Flush the drain pipe to prevent blockages.
2.6 Cleaning the Y-Type Strainer (Water Filter)
1️⃣ Remove the Y-filter cover and take out the mesh filter.
2️⃣ Open the chilled water outlet valve and use backflow pressure to flush out debris.
3️⃣ Reinstall the cleaned filter and secure the cover.
3. Additional Maintenance Checks
✅ Ensure proper water flow: Inspect pipes and valves for leaks.
✅ Verify insulation: Check for damaged or missing insulation to prevent heat loss.
✅ Avoid installing fluorescent lights directly beneath fan coil units to prevent airflow obstruction.
✅ Reinstall all components properly to maintain system integrity.
4. Benefits of Regular Cleaning
✔ Stronger airflow 💨
✔ Improved cooling & heating efficiency ❄️🔥
✔ Lower energy consumption ⚡
✔ Reduced noise levels 🔇
✔ Cleaner indoor air 🌬️
By following this step-by-step cleaning and maintenance guide, you can prolong the lifespan of your fan coil unit, improve its efficiency, and maintain a comfortable indoor environment. 🚀